There are
953 mi
from Chattanooga, TN to San Marcos, TX
That's the driving distance. It would take 17 hours 28 mins to go from Chattanooga, Tennessee to San Marcos, Texas.
The flight distance (direct flight from Chattanooga, TN to San Marcos, TX) is 817.33 mi.
953 mi = 1,533.12 kms